I am trying to replace a missing power supply for a TRS-80 model 1. The original power supply provided unregulated DC ~20V, unregulated AC ~10V and ground. Internally the computer connects the AC to a full wave rectifier with smoothing capacitors. TRS-80 model 1 technical manual, schematic is on page 37 and 38
My understanding is that if I supply positive and negative DC to the AC lines and account for the voltage drop through the rectifier, I should be ok. I would like to keep the original computer unmodified, if possible.